Device for taking core samples in rotary drilling



Dec. 3 1925.

H. H. HAIR DEVICE FOR TAKING CORE SAMPLES IN ROTARY DRILLING Filed Feb 27, 1922 nanny n. Earn, or nnwrora'r' BEACH, CALIFORNIA, ASSIGNOR T FLOYD s. WHITE,

' reverse, or LOS enemas, CALIFORNIA.

PATENT DFFICE.

DEVICE F012, TAKING CORE SAMPLES IN ROTARY DRILLING.,

Application filed February 21, 1922. Serial No. 539,392.

To aZZ 107mm it may concern:

Be it known that I, HARDY H. HAIR, a. bitizen of. the United States, residing at Newport Beach, in the county of Orange and State of California, have invented new and useful Improvements in Devices for Taking (lore Samples in Rotary Drilling, of which the following is a detailed specification.

1 The nature of the invention will be best understood from the following detailed and specific description of'prefcrred forms and specific arrangements of mechanisms embodying the invention, reference for that purpose being had to the accompanying drawings in which:

Fig. 1 is a view partly in elevation and partly in longitudinal section showing my core taking apparatus applied to one form of rotary drilling bit; Fig. 2 is a bottom plan view of the same; Fig. 3 is an enlarged sectional detail showing the up or end of the core taking tube with its vs vs.

In Figs. 1 and 2 I show a form of rotary bit that embodies a mandrel 10 carrying two cutting disks 11. This illustration ma be taken as typical of any of the rotary dri ling bits embodying a mandrel and cutters. I mount a core taking harrel 12in the lower 3 part of the hit, centrally located as illustrathetween the cutters. This barrel may be for instance of a piece of heavy hydraulic pipe having at its lower end a shoe 14 with cutting teeth 15. These teeth may of course he made directly on the lower end oi barrel 12 itself but I prefer to provide a shoe as iTl'lZLi? "Facilitates sharpening of the cutting teeth and also "Facilitates the change in cilective length fifths barrel so that it may he made to prompt a. greater or lesser distance below the lower of cutter 11. For instance,. shoes 14: Oil different lengths may be provided for this purpose. Indifferent kinds of tormations, hard or soft, it is desirable to have the cutting teeth project a lesser or greater distance below cutters 11.

The core taking barrel is extended on upward in any suitahle manner so that acore o-l any desired length may be taken. For instance, the barrel may he extended up:-

ward through the man? 3 and alcove-it as at 17., and then extended urther if desired by extension 18 oi which any number of joints may he supplied so that the eli ective length of the barrel may be made as deemed.

The internal diameter of all these parts is preferably the same so that the core that enters at the bottom of barrel 12 may pass upward with the least disturbance.

* At the upper end of the extended barrel an upwardly opening valve is placed. .l.hi's .valve may embody, a downwardly seating ball 26 in a cage 27 and. pressed down by a spring 28 to make sure that it will seat. the spring being, strong enough to press the ball onto its seatthr'ough any mud that may be under the ball. In order to insure proper action of the spring its lower end is welded or otherwise permanently secured to spring seat 29 that fits on top the ball. The action of this ball valve is to allow water or any other substances to pass upwardly out of the upper end of'the core taking barrel; but when the valve isseated it will prevent a core that is in the barrel from dropping out.

In order further to facilitate vertical adjustment of the core barrel, and to hold the barrel rigidly to its set height, the mandrel 10 is shown split on the central lane 10 and is held together by the tool oint 10'. Barrel 12 has one or more external ribs 40 that lit in corresponding annular grooves 41 in the mandrel, which grooves are so spaced that the barrel may be adjusted up and down by placing the rib orribs in diilerent grooves. The vertical position ofthe lower cutting end of the barrel may be thus adjusted to suit diiierent formations and to compensate wear on the cutting edge 15. The mandrel halves may clamp the barrel tight 1y enough to prevent its slipping rotatively or any suitable means may beused to prevent such slipping.

The bit thus equipped with my core talc- I ing device is used in the ordinary manner.

As the core barrel projects a little below the cutters it is of course at all times cutting directly into the formation at the bottom of the hole; and as the bit is lowered a core from the formation is forced up through the barrel. Thus if it is not desired to obtain a sample this core is .merely continuously pushed up through the barrel and out its upper end where it enters the stream of water passing down through drill stem 30 and is carried by that stream of water downwardly through the bit through the water 'rel. The core may be removed from the barrel in any suitable manner es by pushing it out end'wise, the valve 25 being taken off for this purpose so that the core comes out undisturbed;

The inner diameter of shoe 14,21s inclieated st 1 is preferably less than the inner diameter of the barrel, so that the core out by the shoe will pass easily up through the barrel; and if desired there may be an other slight enlargement in diameter at the extension 17 for the same purpose.

From thes' illustrations it will be apperent how my core taking device may be applied to various other forms of rotary drilling bit. Accordingly, I do not limit my invention to the specific adaptations here illustrated, nor to the specific construction herein described, as the device may be varied to adapt it to diflerent situations.

Having described a preferred form of my invention, 1 claim:

In combination with a rotary drilling bit, split longitudinally, and having a central vertical passage, a core taking barrel clamped have, hereunto subscribed my name this 14;

day of Feb, 1922.

, HARDY i-i. HAIR,

is" between the bit halves in the vertical pas- 

